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Fencer Vulns
high 8.8

CVE-2026-74997 json

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code executio…

published 2026-08-17 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-60164

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver.

Patch / fix

  • Roundcube Webmail 1.6.18, 1.7.3
  • roundcube Debian 12 1.6.5+dfsg-1+deb12u11
  • roundcube Debian 13 1.6.18+dfsg-0+deb13u1
  • roundcube Debian 14 1.6.18+dfsg-1

debian advisories DEBIAN-CVE-2026-74997

  • roundcubemail openSUSE Leap 16.0 1.6.20-bp160.1.1
  • roundcubemail openSUSE Tumbleweed 1.6.19-1.1

opensuse advisories openSUSE-SU-2026:22195-1openSUSE-SU-2026:12169-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-74997 updated cvss 8.8

roundcubemail: remote code execution in markasjunk plugin via crafted placeholder values

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Roundcube Webmail

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.